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A server suddenly spiking full load for over an hour should raise alarms. It shows up even in the dumbest of 5 minute averaging charting tools.

A few minutes of high load can easily get overlooked.

Enterprise systems or any large scale stack can have one running like this where people dismiss it for an hour.

Some systems run hard like this by default. See Transcoding

Also, Weekend and Christmas attacks. In the field we are seeing more attacks with a valid username and pass occur at times when a sysadmin may not be on call.

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